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Energies 2017, 10(12), 2122; https://doi.org/10.3390/en10122122

An Improved Lubrication Model between Piston Rings and Cylinder Liners with Consideration of Liner Dynamic Deformations

1
Department of Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2
Centre for Efficiency and Performance Engineering, University of Huddersfield, Huddersfield HD1 3DH, UK
3
Shanxi Lu’an Taihang Lubricant Co., Ltd., Changzhi 046204, China
*
Author to whom correspondence should be addressed.
Received: 16 October 2017 / Revised: 6 December 2017 / Accepted: 10 December 2017 / Published: 13 December 2017
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Abstract

The friction pair of piston rings and cylinder liner is one of the most important friction couplings in an internal combustion engine. It influences engine efficiency and service life. Under the excitation of piston slaps, the dynamic deformation of cylinder liner is close to the surface roughness magnitudes, which can affect the friction and lubrication performance between the piston rings and cylinder assemblies. To investigate the potential influences of structural deformations to tribological behaviours of cylinder assemblies, the dynamic deformation of the inner surface due to pistons slaps is obtained by dynamic simulations, and then coupled into an improved lubrication model. Different from the traditional lubrication model which takes the pressure stress factor and shear stress factor to be constant, the model proposed in this paper calculated these factors in real time using numerical integration to achieve a more realistic simulation. Based on the improved piston rings and cylinder liner lubrication model, the minimum oil film thickness and friction force curves are obtained for an entire work cycle. It shows that the friction force obtained from the improved model manifests clear oscillations in each stoke, which is different from the smoothed profiles predicted traditionally. Moreover, the average amplitude of the friction forces also shows clear reduction. View Full-Text
Keywords: dynamic deformation; lubrication model; piston ring; cylinder liner; friction force dynamic deformation; lubrication model; piston ring; cylinder liner; friction force
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Li, G.; Gu, F.; Wang, T.; Lu, X.; Zhang, L.; Zhang, C.; Ball, A. An Improved Lubrication Model between Piston Rings and Cylinder Liners with Consideration of Liner Dynamic Deformations. Energies 2017, 10, 2122.

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